Process for producing siccatives



Patented Dec. 31, 1935 I l I 2,025,870

UNITED STATES PATENT DFFICE 2,025,870 raocnss FOR rnonuonacI sroca'rivns Wilhelm Krumbhaar, Detroit, Mich, assignor to Beck, Keller & Company, Inc., Detroit, Mich, a corporation of Delaware No Drawing. Application October 24, 1934, Serial No, 749,864

8 Claims. (01. 134-51) The invention relates to the preparation of ormixed with "an oily dispersing medium (for inganic metal compounds that are intended for use stance, linseed or wood oil stand oil of high disas driers in the paint and varnish industry, and persion power) in a kneading machine or a mixer especially to resinates, naphthenates, oleat'es, of special design, preferably of the closed roller 5 and the like. mill type, excluding air and allowing the use of 5 A large number of methods are known in the vacuum. By kneading at room temperature the art of making compounds of this general type, excess of water comes out easily and the residue intended for use as driers. One method, comof moisture adsorbed at the surfaces of the parprising precipitating oil soluble soaps of the drier ticles is removed by putting the paste under,vac'- 1o metals out of the water solution of the respecuum, the whole procedure taking two to three tive salts, is complicated and expensive. Anhours. Instead of non-volatile dispersing agents other method, comprising incorporating lead and such as oils, high boiling esters and the like, volamanganese into oil by boiling the watery .sustile solvents common in the paint and varnish pension of the precipitated hydroxides of said industry, or combinations of both, may be used.

metals with the oil, is slow because the hydrox- It is also possible to use organic acids or solu- 15 ides are agglomerating. Still another process, tions thereof. in making thefpaste, the use of known as the fusion method, which is carried out which acids or solutions thereof, however, is limby fusing directly the basic metal compounds ited by thickening and hardening of the mass. with the organic acids or their glycerides at After the kneading procedure, the paste of go higher temperatures of between 400-500 F., is hydroxide is reacted with the desired organic disadvantageous in yielding dark and highly acid acids, for instance, naphthenic, abietlc, drying or products. The solution method of making driers non-drying fatty acids, etc., or their respective by reacting the solution of organic acids in suitglycerides by fusing or solution methods in the able solvents with metal compounds has serious usual way. This reaction, however, starts at disadvantages because it involves a considerable temperatures much lower than hitherto known, 25 fire risk, and the solutions are not stable. the reaction proceeds more quickly and com- My invention overcomes all previous disadpletely and leads to lighter and purer products vantages, is simple, quick and cheap, and involves than have been known up to now. This is'due no fire risk. The products resulting therefrom to the fact that the paste made in the way deare definite in composition, uniform, efllcient, scribed above contains the hydroxides of the 30 stable and light in color. drier metals in a fineness of dispersion and a .de-'

The new process involves the step of precipigree of reactivity which has not heretofore been tating the hydroxides of the heavy metals that obtainable. The reaction temperatures are are commonly used as driers, as for instance, calmostly 50100 F. lower than those necessary for cium, zinc, manganese, cobalt, lead, etc., out of the usual hydroxides, in many cases the diffe'r- 35 the aqueous solutions of their respective metal ence in reactivity belngeven larger. This is salts, as for instance their sulphates, chlorides, especially noticeable with cobalt hydroxide. .The acetates, etc., in the usual way, but at room tem- I ordinary cobalt hydroxide does not react at all perature or preferably even lower, and using. wawith a solution of abietic acid in mineral spirits,

ter freed from oxygen or air by previous boiling. even if heatedup to the boiling point of the so- 40 It is important that the hydroxides be preciplution. The hydroxides made according to the itated at low temperatures in order to obtain process described, however, react with this sothem in the finest state of colloidal subdivision. lution completely at temperatures not exceed- Even slightly higher temperatures cause aggloming 200 F. H

eration and crystallization which in turn 'de- The invention will be more fully understood by 45 creases the reactivity. It is also important that reference to the following examples: air be excluded during precipitation and the sub-' Example 1 sequent procedures, because some of the hydroxv ides become less reactive by oxidization. Cobalt sulphate solution is precipitated by the The wet precipitate is then washed by air-free use of an alkali solution at room temperature, 0 cold water, which has been previously boiled. and the precipitated cobalt hydroxide brought on This washing can be donein the usual way either a filter press and washed. The resulting wet in a filter press or in the vat, until neutral repaste is immediately mixed with half the amount action is reached. of linseed oil stand oil and kneaded in the mixer.

The water wet paste of the hydroxides is now As soon as the main part of water has separated 55 out, vacuum is applied in a. closed vessel to remove the residue of water. tained is then dissolved in a 50% solution of rosin and mineral spirits, the amount of which may be varied according to the degree of color and neutrality wanted, and according to the metal content required. The solution is heated to about 200 F., whereby the reaction between abietic acid and cobalt hydroxide commences under these conditions, and approximately this temperature is maintained until the reaction is completed. The resulting product has a light color which cannot be obtained by any other process hitherto known.

Example 2 Manganese hydroxide is precipitated in the usual way from a solution of manganese chloride, treated in the same way as described in Example 1, dehydrated with a small amount of linseed oil fatty acids and slight heating in an atmosphere of C02. The reaction between the manganese hydroxide and the linseed oil stand oil starts and proceeds at 300-350 F., giving a product of unusually light color.

Example 3 Lead hydroxide is precipitated from a solution of lead acetate. The precipitate, in a wet state, is dehydrated by milling at ordinary temperature with thin linseed oil stand oil, followed up by appliance of vacuum within a closed vessel. The paste thus obtained is then heated with additional stand oil up to 100150 R, where the reaction between oil and lead hydroxide is going on even without further addition of any organic acid.

Example 4 Calcium hydroxide obtained in the usual way but precipitated at low temperature is dehy drated in the kneading machine by means of polymerized China wood oil. The oily paste is heated up with an amount of colophony such that 5% by weight of calcium hydroxide figured on the The paste thus obbasis of the rosin is present. The reaction starts and goes on at the surprisingly ,low temperature of 300-350 F., giving a resinate of unusually light color.

It will be understood that the above examples 5 are intended as illustrative only of the inventive thought embodied in this disclosure, and are not intended to limit the invention to the specific details set forth therein.

What I claim is: l0

1. A process for producing a finely divided,

' light colored metallic drier for use in the paint and varnish industry, which comprises precipitating a hydroxide of a metal commonly used as a drier at a temperature not above room temperature under non-oxidizing conditions, dispersing the precipitate in an oil, and reacting the dispersed precipitate without drying the same with a member of a group consisting of resinic, naphthenic and soap forming fatty acids and their glycerides at a temperature below 400 F.

2. A process as set forth in claim 1, wherein the dispersion of the precipitate is increased by the use of vacuum.

3. A process as set forth in claim 1, wherein the reaction takes place at a temperature not exceeding the range of 300-350 F.

4. A process as set forth in claim 1, wherein the metal employed is selected from the group consisting of cobalt, manganese, lead, calcium and zinc.

5. A process as set forth in claim 1, wherein the hydroxide is dispersed in a drying oil.

6. A process as set forth in claim 1, wherein the dispersed precipitate is reacted with abietic acid.

7. A process as set forth in claim 1, wherein. the dispersed hydroxide is reacted with stand oil.

8. A process as set forth in claim 1, wherein 0 the precipitated hydroxide in paste form is mechanically dispersed in. the oil by a kneading operation.

WILHELM KRUMBHAAR. 

